File: coreutils.info,  Node: Combined date and time of day items,  Next: Day of week items,  Prev: Time zone items,  Up: Date input formats

29.5 Combined date and time of day items
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The ISO 8601 date and time of day extended format consists of an ISO
8601 date, a ‘T’ character separator, and an ISO 8601 time of day.  This
format is also recognized if the ‘T’ is replaced by a space.

   In this format, the time of day should use 24-hour notation.
Fractional seconds are allowed, with either comma or period preceding
the fraction.  ISO 8601 fractional minutes and hours are not supported.
Typically, hosts support nanosecond timestamp resolution; excess
precision is silently discarded.

   Here are some examples:

     2022-09-24T20:02:00.052-05:00
     2022-12-31T23:59:59,999999999+11:00
     1970-01-01 00:00Z